Nov. 3, 2008: Republican U.S. vice-presidential candidate Sarah Palin speaks at a campaign rally with her husband Todd Palin at the Grand River Center in Dubuque, Iowa. Mark Hirsch/Getty Images

Dec. 5, 2009: Former Alaska Governor and Republican vice presidential candidate Sarah Palin speaks with a fan as she autographs copies of her book "Going Rogue: An American Life," in a shopping mall in Fairfax, Va. (AFP PHOTO/Paul J. Richards)PAUL J. RICHARDS/AFP/Getty Images

May 29, 2011: Former U.S. Vice presidential candidate and Alaska Governor Sarah Palin rides on the back of a motorcycle before participating in "Rolling Thunder" rally in Arlington, Va. Chip Somodevilla/Getty Images

May 3, 2013: Former Alaska governor Sarah Palin waves before speaking during the 2013 NRA Annual Meeting and Exhibits at the George R. Brown Convention Center in Houston, Texas. Justin Sullivan/Getty Images

Sept. 9, 2015: Reality television personality Phil Robertson and Sarah Palin pose for photographs during a rally against the Iran nuclear deal on the West Lawn of the U.S. Capitol in Washington, D.C. Chip Somodevilla/Getty Images